Author: kp
Date: Tue Jan 23 05:03:26 2018
New Revision: 328277
URL: https://svnweb.freebsd.org/changeset/base/328277
Log:
MFC r327675
pf: Avoid integer overflow issues by using mallocarray() iso. malloc()
pfioctl() handles several ioctl that takes variable length input, these
include:
- DIOCRADDTABLES
- DIOCRDELTABLES
- DIOCRGETTABLES
- DIOCRGETTSTATS
- DIOCRCLRTSTATS
- DIOCRSETTFLAGS
All of them take a pfioc_table struct as input from userland. One of
its elements (pfrio_size) is used in a buffer length calculation.
The calculation contains an integer overflow which if triggered can lead
to out of bound reads and writes later on.
Reported by: Ilja Van Sprundel <ivansprun...@ioactive.com>
Modified:
stable/10/sys/netpfil/pf/pf_ioctl.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/netpfil/pf/pf_ioctl.c
==============================================================================
--- stable/10/sys/netpfil/pf/pf_ioctl.c Tue Jan 23 04:37:31 2018
(r328276)
+++ stable/10/sys/netpfil/pf/pf_ioctl.c Tue Jan 23 05:03:26 2018
(r328277)
@@ -2514,7 +2514,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = io->pfrio_size * sizeof(struct pfr_table);
- pfrts = malloc(totlen, M_TEMP, M_WAITOK);
+ pfrts = mallocarray(io->pfrio_size, sizeof(struct pfr_table),
+ M_TEMP, M_WAITOK);
+ if (! pfrts) {
+ error = ENOMEM;
+ break;
+ }
error = copyin(io->pfrio_buffer, pfrts, totlen);
if (error) {
free(pfrts, M_TEMP);
@@ -2538,7 +2543,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = io->pfrio_size * sizeof(struct pfr_table);
- pfrts = malloc(totlen, M_TEMP, M_WAITOK);
+ pfrts = mallocarray(io->pfrio_size, sizeof(struct pfr_table),
+ M_TEMP, M_WAITOK);
+ if (! pfrts) {
+ error = ENOMEM;
+ break;
+ }
error = copyin(io->pfrio_buffer, pfrts, totlen);
if (error) {
free(pfrts, M_TEMP);
@@ -2562,7 +2572,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = io->pfrio_size * sizeof(struct pfr_table);
- pfrts = malloc(totlen, M_TEMP, M_WAITOK);
+ pfrts = mallocarray(io->pfrio_size, sizeof(struct pfr_table),
+ M_TEMP, M_WAITOK);
+ if (! pfrts) {
+ error = ENOMEM;
+ break;
+ }
PF_RULES_RLOCK();
error = pfr_get_tables(&io->pfrio_table, pfrts,
&io->pfrio_size, io->pfrio_flags | PFR_FLAG_USERIOCTL);
@@ -2583,7 +2598,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = io->pfrio_size * sizeof(struct pfr_tstats);
- pfrtstats = malloc(totlen, M_TEMP, M_WAITOK);
+ pfrtstats = mallocarray(io->pfrio_size,
+ sizeof(struct pfr_tstats), M_TEMP, M_WAITOK);
+ if (! pfrtstats) {
+ error = ENOMEM;
+ break;
+ }
PF_RULES_WLOCK();
error = pfr_get_tstats(&io->pfrio_table, pfrtstats,
&io->pfrio_size, io->pfrio_flags | PFR_FLAG_USERIOCTL);
@@ -2604,7 +2624,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = io->pfrio_size * sizeof(struct pfr_table);
- pfrts = malloc(totlen, M_TEMP, M_WAITOK);
+ pfrts = mallocarray(io->pfrio_size, sizeof(struct pfr_table),
+ M_TEMP, M_WAITOK);
+ if (! pfrts) {
+ error = ENOMEM;
+ break;
+ }
error = copyin(io->pfrio_buffer, pfrts, totlen);
if (error) {
free(pfrts, M_TEMP);
@@ -2628,7 +2653,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = io->pfrio_size * sizeof(struct pfr_table);
- pfrts = malloc(totlen, M_TEMP, M_WAITOK);
+ pfrts = mallocarray(io->pfrio_size, sizeof(struct pfr_table),
+ M_TEMP, M_WAITOK);
+ if (! pfrts) {
+ error = ENOMEM;
+ break;
+ }
error = copyin(io->pfrio_buffer, pfrts, totlen);
if (error) {
free(pfrts, M_TEMP);
@@ -2667,7 +2697,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = io->pfrio_size * sizeof(struct pfr_addr);
- pfras = malloc(totlen, M_TEMP, M_WAITOK);
+ pfras = mallocarray(io->pfrio_size, sizeof(struct pfr_addr),
+ M_TEMP, M_WAITOK);
+ if (! pfras) {
+ error = ENOMEM;
+ break;
+ }
error = copyin(io->pfrio_buffer, pfras, totlen);
if (error) {
free(pfras, M_TEMP);
@@ -2694,7 +2729,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = io->pfrio_size * sizeof(struct pfr_addr);
- pfras = malloc(totlen, M_TEMP, M_WAITOK);
+ pfras = mallocarray(io->pfrio_size, sizeof(struct pfr_addr),
+ M_TEMP, M_WAITOK);
+ if (! pfras) {
+ error = ENOMEM;
+ break;
+ }
error = copyin(io->pfrio_buffer, pfras, totlen);
if (error) {
free(pfras, M_TEMP);
@@ -2722,7 +2762,12 @@ DIOCCHANGEADDR_error:
}
count = max(io->pfrio_size, io->pfrio_size2);
totlen = count * sizeof(struct pfr_addr);
- pfras = malloc(totlen, M_TEMP, M_WAITOK);
+ pfras = mallocarray(count, sizeof(struct pfr_addr), M_TEMP,
+ M_WAITOK);
+ if (! pfras) {
+ error = ENOMEM;
+ break;
+ }
error = copyin(io->pfrio_buffer, pfras, totlen);
if (error) {
free(pfras, M_TEMP);
@@ -2750,7 +2795,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = io->pfrio_size * sizeof(struct pfr_addr);
- pfras = malloc(totlen, M_TEMP, M_WAITOK);
+ pfras = mallocarray(io->pfrio_size, sizeof(struct pfr_addr),
+ M_TEMP, M_WAITOK);
+ if (! pfras) {
+ error = ENOMEM;
+ break;
+ }
PF_RULES_RLOCK();
error = pfr_get_addrs(&io->pfrio_table, pfras,
&io->pfrio_size, io->pfrio_flags | PFR_FLAG_USERIOCTL);
@@ -2771,7 +2821,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = io->pfrio_size * sizeof(struct pfr_astats);
- pfrastats = malloc(totlen, M_TEMP, M_WAITOK);
+ pfrastats = mallocarray(io->pfrio_size,
+ sizeof(struct pfr_astats), M_TEMP, M_WAITOK);
+ if (! pfrastats) {
+ error = ENOMEM;
+ break;
+ }
PF_RULES_RLOCK();
error = pfr_get_astats(&io->pfrio_table, pfrastats,
&io->pfrio_size, io->pfrio_flags | PFR_FLAG_USERIOCTL);
@@ -2792,7 +2847,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = io->pfrio_size * sizeof(struct pfr_addr);
- pfras = malloc(totlen, M_TEMP, M_WAITOK);
+ pfras = mallocarray(io->pfrio_size, sizeof(struct pfr_addr),
+ M_TEMP, M_WAITOK);
+ if (! pfras) {
+ error = ENOMEM;
+ break;
+ }
error = copyin(io->pfrio_buffer, pfras, totlen);
if (error) {
free(pfras, M_TEMP);
@@ -2819,7 +2879,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = io->pfrio_size * sizeof(struct pfr_addr);
- pfras = malloc(totlen, M_TEMP, M_WAITOK);
+ pfras = mallocarray(io->pfrio_size, sizeof(struct pfr_addr),
+ M_TEMP, M_WAITOK);
+ if (! pfras) {
+ error = ENOMEM;
+ break;
+ }
error = copyin(io->pfrio_buffer, pfras, totlen);
if (error) {
free(pfras, M_TEMP);
@@ -2846,7 +2911,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = io->pfrio_size * sizeof(struct pfr_addr);
- pfras = malloc(totlen, M_TEMP, M_WAITOK);
+ pfras = mallocarray(io->pfrio_size, sizeof(struct pfr_addr),
+ M_TEMP, M_WAITOK);
+ if (! pfras) {
+ error = ENOMEM;
+ break;
+ }
error = copyin(io->pfrio_buffer, pfras, totlen);
if (error) {
free(pfras, M_TEMP);
@@ -2888,7 +2958,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = sizeof(struct pfioc_trans_e) * io->size;
- ioes = malloc(totlen, M_TEMP, M_WAITOK);
+ ioes = mallocarray(io->size, sizeof(struct pfioc_trans_e),
+ M_TEMP, M_WAITOK);
+ if (! ioes) {
+ error = ENOMEM;
+ break;
+ }
error = copyin(io->array, ioes, totlen);
if (error) {
free(ioes, M_TEMP);
@@ -2954,7 +3029,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = sizeof(struct pfioc_trans_e) * io->size;
- ioes = malloc(totlen, M_TEMP, M_WAITOK);
+ ioes = mallocarray(io->size, sizeof(struct pfioc_trans_e),
+ M_TEMP, M_WAITOK);
+ if (! ioes) {
+ error = ENOMEM;
+ break;
+ }
error = copyin(io->array, ioes, totlen);
if (error) {
free(ioes, M_TEMP);
@@ -3020,7 +3100,12 @@ DIOCCHANGEADDR_error:
break;
}
totlen = sizeof(struct pfioc_trans_e) * io->size;
- ioes = malloc(totlen, M_TEMP, M_WAITOK);
+ ioes = mallocarray(io->size, sizeof(struct pfioc_trans_e),
+ M_TEMP, M_WAITOK);
+ if (! ioes) {
+ error = ENOMEM;
+ break;
+ }
error = copyin(io->array, ioes, totlen);
if (error) {
free(ioes, M_TEMP);
@@ -3221,7 +3306,12 @@ DIOCCHANGEADDR_error:
}
bufsiz = io->pfiio_size * sizeof(struct pfi_kif);
- ifstore = malloc(bufsiz, M_TEMP, M_WAITOK);
+ ifstore = mallocarray(io->pfiio_size, sizeof(struct pfi_kif),
+ M_TEMP, M_WAITOK);
+ if (! ifstore) {
+ error = ENOMEM;
+ break;
+ }
PF_RULES_RLOCK();
pfi_get_ifaces(io->pfiio_name, ifstore, &io->pfiio_size);
PF_RULES_RUNLOCK();
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